/*
 * Copyright (c) Rafael Steil
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided 
 * that the following conditions are met:
 * 
 * 1) Redistributions of source code must retain the above 
 * copyright notice, this list of conditions and the 
 * following  disclaimer.
 * 2)  Redistributions in binary form must reproduce the 
 * above copyright notice, this list of conditions and 
 * the following disclaimer in the documentation and/or 
 * other materials provided with the distribution.
 * 3) Neither the name of "Rafael Steil" nor 
 * the names of its contributors may be used to endorse 
 * or promote products derived from this software without 
 * specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT 
 * HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, 
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 
 * THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 
 * IN CONTRACT, STRICT LIABILITY, OR TORT 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
 * 
 * This file creation date: Apr 6, 2003 / 2:38:28 PM
 * The JForum Project
 * http://www.jforum.net
 */
package net.jforum.dao.generic;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import net.jforum.JForumExecutionContext;
import net.jforum.SessionFacade;
import net.jforum.dao.DataAccessDriver;
import net.jforum.dao.ForumDAO;
import net.jforum.dao.PollDAO;
import net.jforum.dao.PostDAO;
import net.jforum.entities.KarmaStatus;
import net.jforum.entities.Topic;
import net.jforum.entities.User;
import net.jforum.util.preferences.ConfigKeys;
import net.jforum.util.preferences.SystemGlobals;
import net.jforum.repository.ForumRepository;

/**
 * @author Rafael Steil
 * @version $Id$
 */
public class GenericTopicDAO extends AutoKeys implements
		net.jforum.dao.TopicDAO {
	/**
	 * @see net.jforum.dao.TopicDAO#fixFirstLastPostId(int)
	 */
	public void fixFirstLastPostId(int topicId) throws Exception {
		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(
						SystemGlobals.getSql("TopicModel.getFirstLastPostId"));
		p.setInt(1, topicId);

		ResultSet rs = p.executeQuery();
		if (rs.next()) {
			int first = rs.getInt("first_post_id");
			int last = rs.getInt("last_post_id");

			rs.close();
			p.close();

			p = JForumExecutionContext.getConnection().prepareStatement(
					SystemGlobals.getSql("TopicModel.fixFirstLastPostId"));
			p.setInt(1, first);
			p.setInt(2, last);
			p.setInt(3, topicId);
			p.executeUpdate();
		}

		rs.close();
		p.close();
	}

	/**
	 * @see net.jforum.dao.TopicDAO#selectById(int)
	 */
	public Topic selectById(int topicId) throws Exception {
		PreparedStatement p = JForumExecutionContext
				.getConnection()
				.prepareStatement(SystemGlobals.getSql("TopicModel.selectById"));
		p.setInt(1, topicId);

		Topic t = new Topic();
		List l = this.fillTopicsData(p);

		if (l.size() > 0) {
			t = (Topic) l.get(0);
		}

		return t;
	}

	/**
	 * @see net.jforum.dao.TopicDAO#selectRaw(int)
	 */
	public Topic selectRaw(int topicId) throws Exception {
		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(SystemGlobals.getSql("TopicModel.selectRaw"));
		p.setInt(1, topicId);

		Topic t = new Topic();
		ResultSet rs = p.executeQuery();
		if (rs.next()) {
			t = this.getBaseTopicData(rs);
		}

		rs.close();
		p.close();
		return t;
	}

	/**
	 * @see net.jforum.dao.TopicDAO#delete(int)
	 */
	public void delete(final Topic topic) throws Exception {
		this.deleteTopics(new ArrayList() {
			{
				add(topic);
			}
		});
	}

	public void deleteTopics(List topics) throws Exception {
		// Topic
		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(SystemGlobals.getSql("TopicModel.delete"));
		ForumDAO forumDao = DataAccessDriver.getInstance().newForumDAO();

		PostDAO postDao = DataAccessDriver.getInstance().newPostDAO();
		PollDAO pollDao = DataAccessDriver.getInstance().newPollDAO();

		for (Iterator iter = topics.iterator(); iter.hasNext();) {
			Topic topic = (Topic) iter.next();

			// Remove watches
			this.removeSubscriptionByTopic(topic.getId());

			// Remove the messages
			postDao.deleteByTopic(topic.getId());

			// Remove the poll
			pollDao.deleteByTopicId(topic.getId());

			// Delete the topic itself
			p.setInt(1, topic.getId());
			p.executeUpdate();

			forumDao.decrementTotalTopics(topic.getForumId(), 1);
		}

		p.close();
	}

	/**
	 * @see net.jforum.dao.TopicDAO#deleteByForum(int)
	 */
	public void deleteByForum(int forumId) throws Exception {
		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(
						SystemGlobals.getSql("TopicModel.deleteByForum"));
		p.setInt(1, forumId);

		ResultSet rs = p.executeQuery();
		List topics = new ArrayList();
		while (rs.next()) {
			Topic t = new Topic();
			t.setId(rs.getInt("topic_id"));

			topics.add(t);
		}

		rs.close();
		p.close();

		this.deleteTopics(topics);
	}

	/**
	 * @see net.jforum.dao.TopicDAO#update(net.jforum.Topic)
	 */
	public void update(Topic topic) throws Exception {
		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(SystemGlobals.getSql("TopicModel.update"));

		p.setString(1, topic.getTitle());
		p.setInt(2, topic.getLastPostId());
		p.setInt(3, topic.getFirstPostId());
		p.setInt(4, topic.getType());
		p.setInt(5, topic.isModerated() ? 1 : 0);
		p.setInt(6, topic.getVoteId());
		p.setInt(7, topic.getId());
		p.executeUpdate();

		p.close();
	}

	/**
	 * @see net.jforum.dao.TopicDAO#addNew(net.jforum.Topic)
	 */
	public int addNew(Topic topic) throws Exception {
		PreparedStatement p = this.getStatementForAutoKeys("TopicModel.addNew");

		p.setInt(1, topic.getForumId());
		p.setString(2, topic.getTitle());
		p.setInt(3, topic.getPostedBy().getId());
		p.setTimestamp(4, new Timestamp(topic.getTime().getTime()));
		p.setInt(5, topic.getFirstPostId());
		p.setInt(6, topic.getLastPostId());
		p.setInt(7, topic.getType());
		p.setInt(8, topic.isModerated() ? 1 : 0);

		this.setAutoGeneratedKeysQuery(SystemGlobals
				.getSql("TopicModel.lastGeneratedTopicId"));
		int topicId = this.executeAutoKeysQuery(p);

		p.close();
		return topicId;
	}

	/**
	 * @see net.jforum.dao.TopicDAO#incrementTotalViews(int)
	 */
	public void incrementTotalViews(int topicId) throws Exception {
		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(
						SystemGlobals.getSql("TopicModel.incrementTotalViews"));
		p.setInt(1, topicId);
		p.executeUpdate();
		p.close();
	}

	/**
	 * @see net.jforum.dao.TopicDAO#incrementTotalReplies(int)
	 */
	public void incrementTotalReplies(int topicId) throws Exception {
		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(
						SystemGlobals
								.getSql("TopicModel.incrementTotalReplies"));
		p.setInt(1, topicId);
		p.executeUpdate();
		p.close();
	}

	/**
	 * @see net.jforum.dao.TopicDAO#decrementTotalReplies(int)
	 */
	public void decrementTotalReplies(int topicId) throws Exception {
		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(
						SystemGlobals
								.getSql("TopicModel.decrementTotalReplies"));
		p.setInt(1, topicId);
		p.executeUpdate();
		p.close();
	}

	/**
	 * @see net.jforum.dao.TopicDAO#setLastPostId(int, int)
	 */
	public void setLastPostId(int topicId, int postId) throws Exception {
		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(
						SystemGlobals.getSql("TopicModel.setLastPostId"));
		p.setInt(1, postId);
		p.setInt(2, topicId);
		p.executeUpdate();
		p.close();
	}

	/**
	 * @see net.jforum.dao.TopicDAO#selectAllByForum(int)
	 */
	public List selectAllByForum(int forumId) throws Exception {
		return this.selectAllByForumByLimit(forumId, 0, Integer.MAX_VALUE);
	}

	/**
	 * @see net.jforum.dao.TopicDAO#selectAllByForumByLimit(int, int, int)
	 */
	public List selectAllByForumByLimit(int forumId, int startFrom, int count)
			throws Exception {
		String sql = SystemGlobals.getSql("TopicModel.selectAllByForumByLimit");

		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(sql);
		p.setInt(1, forumId);
		p.setInt(2, startFrom);
		p.setInt(3, count);

		return this.fillTopicsData(p);
	}

	/**
	 * @see net.jforum.dao.TopicDAO#selectByUserByLimit(int, int, int)
	 */
	public List selectByUserByLimit(int userId, int startFrom, int count)
			throws Exception {
		PreparedStatement p = JForumExecutionContext
				.getConnection()
				.prepareStatement(
						SystemGlobals.getSql("TopicModel.selectByUserByLimit")
								.replaceAll(":fids:",
										ForumRepository.getListAllowedForums()));

		p.setInt(1, userId);
		p.setInt(2, startFrom);
		p.setInt(3, count);

		return this.fillTopicsData(p);
	}

	/**
	 * @see net.jforum.dao.TopicDAO#countUserTopics(int)
	 */
	public int countUserTopics(int userId) throws Exception {
		int total = 0;

		PreparedStatement p = JForumExecutionContext
				.getConnection()
				.prepareStatement(
						SystemGlobals.getSql("TopicModel.countUserTopics")
								.replaceAll(":fids:",
										ForumRepository.getListAllowedForums()));
		p.setInt(1, userId);

		ResultSet rs = p.executeQuery();

		if (rs.next()) {
			total = rs.getInt(1);
		}

		rs.close();
		p.close();

		return total;
	}

	protected Topic getBaseTopicData(ResultSet rs) throws Exception {
		Topic t = new Topic();

		t.setTitle(rs.getString("topic_title"));
		t.setId(rs.getInt("topic_id"));
		t.setTime(new Date(rs.getTimestamp("topic_time").getTime()));
		t.setStatus(rs.getInt("topic_status"));
		t.setTotalViews(rs.getInt("topic_views"));
		t.setTotalReplies(rs.getInt("topic_replies"));
		t.setFirstPostId(rs.getInt("topic_first_post_id"));
		t.setLastPostId(rs.getInt("topic_last_post_id"));
		t.setType(rs.getInt("topic_type"));
		t.setForumId(rs.getInt("forum_id"));
		t.setModerated(rs.getInt("moderated") == 1);
		t.setVoteId(rs.getInt("topic_vote_id"));

		return t;
	}

	/**
	 * @see net.jforum.dao.TopicDAO#autoSetLastPostId(int)
	 */
	public int getMaxPostId(int topicId) throws Exception {
		int id = -1;

		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(
						SystemGlobals.getSql("TopicModel.getMaxPostId"));
		p.setInt(1, topicId);

		ResultSet rs = p.executeQuery();
		if (rs.next()) {
			id = rs.getInt("post_id");
		}

		rs.close();
		p.close();

		return id;
	}

	/**
	 * @see net.jforum.dao.TopicDAO#getTotalPosts(int)
	 */
	public int getTotalPosts(int topicId) throws Exception {
		int total = 0;

		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(
						SystemGlobals.getSql("TopicModel.getTotalPosts"));
		p.setInt(1, topicId);

		ResultSet rs = p.executeQuery();
		if (rs.next()) {
			total = rs.getInt("total");
		}

		rs.close();
		p.close();

		return total;
	}

	/**
	 * @see net.jforum.dao.TopicDAO#notifyUsers(int)
	 */
	public List notifyUsers(Topic topic) throws Exception {
		int posterId = SessionFacade.getUserSession().getUserId();
		int anonUser = SystemGlobals.getIntValue(ConfigKeys.ANONYMOUS_USER_ID);

		PreparedStatement stmt = JForumExecutionContext.getConnection()
				.prepareStatement(
						SystemGlobals.getSql("TopicModel.notifyUsers"));
		ResultSet rs = null;

		stmt.setInt(1, topic.getId());
		stmt.setInt(2, posterId); // don't notify the poster
		stmt.setInt(3, anonUser); // don't notify the anonimous user

		rs = stmt.executeQuery();

		List users = new ArrayList();
		while (rs.next()) {
			User user = new User();

			user.setId(rs.getInt("user_id"));
			user.setEmail(rs.getString("user_email"));
			user.setUsername(rs.getString("username"));
			user.setLang(rs.getString("user_lang"));

			users.add(user);
		}

		// Set read status to false
		stmt = JForumExecutionContext.getConnection().prepareStatement(
				SystemGlobals.getSql("TopicModel.markAllAsUnread"));
		stmt.setInt(1, topic.getId());
		stmt.setInt(2, posterId); // don't notify the poster
		stmt.setInt(3, anonUser); // don't notify the anonimous user

		stmt.executeUpdate();

		rs.close();
		stmt.close();

		return users;
	}

	/**
	 * @see net.jforum.dao.TopicDAO#subscribeUser(int, int)
	 */
	public void subscribeUser(int topicId, int userId) throws Exception {
		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(
						SystemGlobals.getSql("TopicModel.subscribeUser"));

		p.setInt(1, topicId);
		p.setInt(2, userId);

		p.executeUpdate();
		p.close();
	}

	/**
	 * @see net.jforum.dao.TopicDAO#isUserSubscribing(int, int)
	 */
	public boolean isUserSubscribed(int topicId, int userId) throws Exception {
		PreparedStatement stmt = JForumExecutionContext.getConnection()
				.prepareStatement(
						SystemGlobals.getSql("TopicModel.isUserSubscribed"));
		ResultSet rs = null;

		stmt.setInt(1, topicId);
		stmt.setInt(2, userId);

		rs = stmt.executeQuery();
		boolean status = rs.next();

		rs.close();
		stmt.close();

		return status;
	}

	/**
	 * @see net.jforum.dao.TopicDAO#removeSubscription(int, int)
	 */
	public void removeSubscription(int topicId, int userId) throws Exception {
		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(
						SystemGlobals.getSql("TopicModel.removeSubscription"));
		p.setInt(1, topicId);
		p.setInt(2, userId);

		p.executeUpdate();
		p.close();
	}

	/**
	 * @see net.jforum.dao.TopicDAO#removeSubscriptionByTopic(int)
	 */
	public void removeSubscriptionByTopic(int topicId) throws Exception {
		PreparedStatement p = JForumExecutionContext
				.getConnection()
				.prepareStatement(
						SystemGlobals
								.getSql("TopicModel.removeSubscriptionByTopic"));
		p.setInt(1, topicId);

		p.executeUpdate();
		p.close();
	}

	/**
	 * @see net.jforum.dao.TopicDAO#updateReadStatus(int, int, boolean)
	 */
	public void updateReadStatus(int topicId, int userId, boolean read)
			throws Exception {
		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(
						SystemGlobals.getSql("TopicModel.updateReadStatus"));
		p.setInt(1, read ? 1 : 0);
		p.setInt(2, topicId);
		p.setInt(3, userId);

		p.executeUpdate();
		p.close();
	}

	/**
	 * @see net.jforum.dao.TopicDAO#lockUnlock(int, int)
	 */
	public void lockUnlock(int[] topicId, int status) throws Exception {
		PreparedStatement p = JForumExecutionContext
				.getConnection()
				.prepareStatement(SystemGlobals.getSql("TopicModel.lockUnlock"));
		p.setInt(1, status);

		for (int i = 0; i < topicId.length; i++) {
			p.setInt(2, topicId[i]);
			p.executeUpdate();
		}
		p.close();
	}

	/**
	 * Fills all topic data. The method will try to get all fields from the
	 * topics table, as well information about the user who made the first and
	 * the last post in the topic. <br>
	 * <b>The method <i>will</i> close the <i>PreparedStatement</i></b>
	 * 
	 * @param p
	 *            the PreparedStatement to execute
	 * @return A list with all topics found
	 * @throws Exception
	 */
	public List fillTopicsData(PreparedStatement p) throws Exception {
		List l = new ArrayList();

		ResultSet rs = p.executeQuery();

		SimpleDateFormat df = new SimpleDateFormat(SystemGlobals
				.getValue(ConfigKeys.DATE_TIME_FORMAT));

		StringBuffer sbFirst = new StringBuffer(128);
		StringBuffer sbLast = new StringBuffer(128);

		while (rs.next()) {
			Topic t = this.getBaseTopicData(rs);

			// Posted by
			User u = new User();
			u.setId(rs.getInt("user_id"));
			t.setPostedBy(u);

			// Last post by
			u = new User();
			u.setId(rs.getInt("last_user_id"));
			t.setLastPostBy(u);

			t.setHasAttach(rs.getInt("attach") > 0);
			t.setFirstPostTime(df.format(rs.getTimestamp("topic_time")));
			t.setLastPostTime(df.format(rs.getTimestamp("post_time")));
			t.setLastPostDate(new Date(rs.getTimestamp("post_time").getTime()));

			l.add(t);

			sbFirst.append(rs.getInt("user_id")).append(',');
			sbLast.append(rs.getInt("last_user_id")).append(',');
		}

		rs.close();
		p.close();

		// Users
		if (sbFirst.length() > 0) {
			sbLast.delete(sbLast.length() - 1, sbLast.length());

			String sql = SystemGlobals.getSql("TopicModel.getUserInformation");
			sql = sql
					.replaceAll("#ID#", sbFirst.toString() + sbLast.toString());

			Map users = new HashMap();

			p = JForumExecutionContext.getConnection().prepareStatement(sql);
			rs = p.executeQuery();

			while (rs.next()) {
				users.put(new Integer(rs.getInt("user_id")), rs
						.getString("username"));
			}

			rs.close();
			p.close();

			for (Iterator iter = l.iterator(); iter.hasNext();) {
				Topic t = (Topic) iter.next();
				t.getPostedBy().setUsername(
						(String) users
								.get(new Integer(t.getPostedBy().getId())));
				t.getLastPostBy().setUsername(
						(String) users.get(new Integer(t.getLastPostBy()
								.getId())));
			}
		}

		return l;
	}

	/**
	 * @see net.jforum.dao.TopicDAO#selectRecentTopics(int)
	 */
	public List selectRecentTopics(int limit) throws Exception {
		PreparedStatement p = JForumExecutionContext
				.getConnection()
				.prepareStatement(
						SystemGlobals
								.getSql("TopicModel.selectRecentTopicsByLimit"));
		p.setInt(1, limit);

		return this.fillTopicsData(p);
	}

	/**
	 * @see net.jforum.dao.TopicDAO#setFirstPostId(int, int)
	 */
	public void setFirstPostId(int topicId, int postId) throws Exception {
		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(
						SystemGlobals.getSql("TopicModel.setFirstPostId"));
		p.setInt(1, postId);
		p.setInt(2, topicId);
		p.executeUpdate();
		p.close();
	}

	/**
	 * @see net.jforum.dao.TopicDAO#getMinPostId(int)
	 */
	public int getMinPostId(int topicId) throws Exception {
		int id = -1;

		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(
						SystemGlobals.getSql("TopicModel.getMinPostId"));
		p.setInt(1, topicId);

		ResultSet rs = p.executeQuery();
		if (rs.next()) {
			id = rs.getInt("post_id");
		}

		rs.close();
		p.close();

		return id;
	}

	/**
	 * @see net.jforum.dao.TopicDAO#setModerationStatus(int, boolean)
	 */
	public void setModerationStatus(int forumId, boolean status)
			throws Exception {
		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(
						SystemGlobals.getSql("TopicModel.setModerationStatus"));
		p.setInt(1, status ? 1 : 0);
		p.setInt(2, forumId);
		p.executeUpdate();
		p.close();
	}

	/**
	 * @see net.jforum.dao.TopicDAO#setModerationStatusByTopic(int, boolean)
	 */
	public void setModerationStatusByTopic(int topicId, boolean status)
			throws Exception {
		PreparedStatement p = JForumExecutionContext
				.getConnection()
				.prepareStatement(
						SystemGlobals
								.getSql("TopicModel.setModerationStatusByTopic"));
		p.setInt(1, status ? 1 : 0);
		p.setInt(2, topicId);
		p.executeUpdate();
		p.close();
	}

	/**
	 * @see net.jforum.dao.TopicDAO#selectTopicTitlesByIds(java.util.Collection)
	 */
	public List selectTopicTitlesByIds(Collection idList) throws Exception {
		List l = new ArrayList();
		String sql = SystemGlobals.getSql("TopicModel.selectTopicTitlesByIds");

		StringBuffer sb = new StringBuffer(idList.size() * 2);
		for (Iterator iter = idList.iterator(); iter.hasNext();) {
			sb.append(iter.next()).append(",");
		}

		int len = sb.length();
		sql = sql.replaceAll(":ids:", len > 0 ? sb.toString().substring(0,
				len - 1) : "0");
		PreparedStatement p = JForumExecutionContext.getConnection()
				.prepareStatement(sql);

		ResultSet rs = p.executeQuery();
		while (rs.next()) {
			Map m = new HashMap();
			m.put("id", new Integer(rs.getInt("topic_id")));
			m.put("title", rs.getString("topic_title"));

			l.add(m);
		}

		rs.close();
		p.close();

		return l;
	}

	/**
	 * @see net.jforum.model.UserModel#topicPosters(int)
	 */
	public Map topicPosters(int topicId) throws Exception {
		Map m = new HashMap();
		PreparedStatement p;

		StringBuffer sql = new StringBuffer(SystemGlobals
				.getSql("TopicModel.topicPosters"));

		if (SystemGlobals.getBoolValue(ConfigKeys.DATABASE_SUPPORT_SUBQUERIES)) {
			int index = sql.indexOf(":ids:");
			sql.replace(index, index + 5, SystemGlobals
					.getSql("TopicModel.distinctPosters"));

			p = JForumExecutionContext.getConnection().prepareStatement(
					sql.toString());
			p.setInt(1, topicId);
		} else {
			p = JForumExecutionContext.getConnection().prepareStatement(
					SystemGlobals.getSql("TopicModel.distinctPosters"));
			p.setInt(1, topicId);

			ResultSet rs = p.executeQuery();

			StringBuffer sb = new StringBuffer();

			while (rs.next()) {
				sb.append(rs.getInt("user_id")).append(',');
			}

			rs.close();
			p.close();

			int index = sql.indexOf(":ids:");
			sql.replace(index, index + 5, sb.substring(0, sb.length() - 1));

			p = JForumExecutionContext.getConnection().prepareStatement(
					sql.toString());
		}

		ResultSet rs = p.executeQuery();

		while (rs.next()) {
			User u = new User();

			u.setId(rs.getInt("user_id"));
			u.setUsername(rs.getString("username"));
			u.setKarma(new KarmaStatus(u.getId(), rs.getDouble("user_karma")));
			u.setAvatar(rs.getString("user_avatar"));
			u.setAvatarEnabled(rs.getInt("user_allowavatar") == 1);
			u.setRegistrationDate(new Date(rs.getTimestamp("user_regdate")
					.getTime()));
			u.setTotalPosts(rs.getInt("user_posts"));
			u.setFrom(rs.getString("user_from"));
			u.setEmail(rs.getString("user_email"));
			u.setRankId(rs.getInt("rank_id"));
			u.setViewEmailEnabled(rs.getInt("user_viewemail") == 1);
			u.setIcq(rs.getString("user_icq"));
			u.setAttachSignatureEnabled(rs.getInt("user_attachsig") == 1);
			u.setMsnm(rs.getString("user_msnm"));
			u.setYim(rs.getString("user_yim"));
			u.setWebSite(rs.getString("user_website"));
			u.setAim(rs.getString("user_aim"));
			u.setSignature(rs.getString("user_sig"));

			m.put(new Integer(u.getId()), u);
		}

		rs.close();
		p.close();

		return m;
	}
}
